Synonyms and related words :
Judas-like, Trojan-horse, apostate, betraying, breakaway, collaborative, degenerate, disloyal, double-crossing, extreme, extremistic, factious, faithless, fifth-column, insurgent, insurrectionary, mutineering, mutinous, quisling, quislingistic, rebel, rebellious, recreant, renegade, revolutional, revolutionary, riotous, seditionary, seditious, subversive, tergiversant, tergiversating, traitorous, treasonous, turbulent, turncoat, two-timing